VERFAHREN ZUR SICHERUNG VON DATEN IN EINEM TRAGBAREN MASSENSPEICHER GEGEN UNAUTORISIERTE VERVIELFÄLTIGUNG

To secure multimedia information and software stored in a portable mass memory (22) against unauthorized duplication the data are stored in said mass memory (22) in distorted form. In the system (10) for playing back the data a personal identity code of the authorized user is stored in a personal serial analog memory (SAM) module. The correction keys necessary for correction of the data are stored in the SAM module of the authorized user. An authorization code is assigned to said data, which is also stored in the SAM module. An authorization code encoded by means of the personal identity code is generated in the SAM module and then stored in the mass memory (22). Before the data are played back the encoded authorization code is decoded by the SAM module by means of the personal identity code. The decoded authorization code is then compared with the authorization code stored in the SAM module and correction by means of the correction key of the data read out from the mass memory (22) is approved only if the authorization codes coincide.